How do you create new folders in BML util library?

Summary: I would like to organize our BML library in folders. For example: string for string functions, math for math functions, config for configuration functions, etc. When in CPQ it shows the folder "util". How do we create additional folders?

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

26A

Code Snippet (add any code snippets that support your topic, if applicable):